检索结果-南通市图书馆

Exploitation of Fenton and Fenton-like reagents as alternative conditioners for alum sludge conditioning

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第1期21卷 101-105页

作者： maha A. Tony Y. q. Zhao Aghareed m. Tayeb Centre for Water Resources Research School of Architecture Landscape and Civil Engineering University College Dublin Newstead Belfield Dublin 4 Ireland. Basic Science of Engineering Department Faculty of Engineering Minoufiya University Minoufiya 32511 Egypt Chemical Engineering Department Faculty of Engineering Minia University Minia 61111 Egypt

The use of Fenton＇s reagent （Fe^2＋/H2O2） and Fenton-like reagents containing transition metals of Cu（Ⅱ）, Zn（Ⅱ）, Co（Ⅱ）, and mn（Ⅱ） for an alum sludge conditioning to improve its dewaterability was investigated. The results obtained were compared with those obtained from conditioning the same alum sludge using cationic and anionic polymers. Experimental results show that Fenton＇s reagent was the best among the Fenton and Fenton-like reagents for the alum sludge conditioning. A considerable effectiveness of capillary suction time （CST） reduction efficiency of 47% can be achieved under test conditions of Fe^2＋/H2O2 = 20/125 mg/g DS （dry solid） and pH 6.0. The observation of floc-like particles after Fenton＇s reagent conditioning of alum sludge suggested that the mechanism of Fenton＇s reagent conditioning was different from that of polymer conditioning. In spite of the lower efficiency in the CST reduction of Fenton＇s reagent in alum sludge conditioning compared to that of polymer conditioning, Fenton＇s reagent offers a more environmentally safe option. Tiffs study provided an example of proactive treatment engineering, which is aimed at seeking a safe alternative to the use of polymers in sludge conditioning towards achieving a more sustainable sludge management strategy.

关键词： alum sludge conditioning Fenton and Fenton-like reagents organic polymers cost estimate

NUmERICAL SImULATION OF 3-D CORNER FLOWS IN A CIRCULATING WATER CHANNEL

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2001年第2期13卷 63-67页

作者： Huang, Y. Wang, G.q. Tamashima, m. Shanghai Jiaotong Univ. Shanghai 200030 China

A Navier-Stokes procedure was developed based on a finite volume method to simulate corner flows in circulating water channel (CWC). The standard 2nd-order central scheme together with a deferred correction method was applied for the convective terms. All the other terms were discretized using 2nd order central differencing. The standard k-Ε model was used for the approximation of turbulent flows. First, this method used to calculate the turbulent flows in a 90° bend and the computed results are in good agreements with the experiment. This method was also employed to calculate the flows in a model CWC corner.

关键词： Computational fluid dynamics Computer simulation Finite volume method Laminar flow Navier Stokes equations Three dimensional Turbulent flow

Twinnability Predication for fcc metals

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2011年第2期27卷 97-100页

作者： B.q.Li m.L.Sui S.X.mao Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Institute of microstructure and Properties of Advanced materials Beijing University of TechnologyBeijing 100124China Department of mechanical Engineering and materials Science University of PittsburghPittsburghPennsylvania 15261USA

Inherent twinnability of face-centered-cubic（fcc） metals was analyzed based on the direct competition between twinning partial dislocation nucleation and trailing partial dislocation nucleation,with which the twinnability of fcc metals can be simply expressed as function of the stacking-fault energy,the unstable stacking-fault energy,and the unstable twinningfault energy of fcc *** predicted twinnability ranking matched well with former experimental results and provided a physical insight to understand twinnability from crystallographic orientation and fault energy parameters.

关键词： Deformation twinning fcc metals Twinnability

EVALUATION OF THE PROBABILITY DISTRIBUTION OF PITTING CORROSION FATIGUE LIFE IN AIRCRAFT mATERIALS

在线全文

学校读者我要写书评

暂无评论

Acta mechanica Sinica 2003年第3期19卷 247-252页

作者：王清远 N.KAWAGOISHI q.Chen R.m.PIDAPARTI Dept.of Civil Eng.and mechanics Sichuan UniversityChengdu 610065China

Corrosion and fatigue properties of aircraft materials are known to have a considerable scatter due to the random nature of materials,loading,and environmental conditions.A probabilistic approach for predicting the pitting corrosion fatigue life has been investigated which captures the effect of the interaction of the cyclic load and corrosive environment and all stages of the corrosion fatigue process (*** pit nucleation and growth,pit-crack transition,short- and long-crack propagation).The probabilistic model investigated considers the uncertainties in the initial pit size,corrosion pitting current,and material properties due to the scatter found in the experimental *** Carlo simulations were performed to define the failure probability *** cumulative distribution functions of fatigue life agreed reasonably well with the existing experimental data.

关键词： pitting corrosion fatigue probabilistic modeling fatigue life prediction

FHL2 deficiency aggravates Candida albicans infection through decreased myelopoiesis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Life Sciences 2025年

作者： Rongmei Gao Kanchao Chen Yimin Wang Rongxia Guo Xiaoyu Zhang peng Wu Weili Wang qingxiang Huang Xuemei Xie Shangda Yang Yanling Lü qian Ren Fei Liu Song Chen Fengxia ma Tao Cheng Hui Cheng State Key Laboratory of Experimental Hematology National Clinical Research Center for Blood Diseases Haihe Laboratory of Cell Ecosystem Institute of Hematology & Blood Diseases Hospital Chinese Academy of Medical Sciences & Peking Union Medical College CAmS Center for Stem Cell medicine PUMC Department of Stem Cell and Regenerative Medicine

Hematopoiesis is a finely tuned process that generates all blood cell types through self-renewal and differentiation, which is crucial for maintaining homeostasis. Acute infections can prompt a hematopoietic response known as emergency myelopoiesis. In this study, using a Candida albicans (C. albicans) infection model, we demonstrated for the first time that disruption of Fhl2 led to increased fungal burden,heightened inflammatory response and reduced survival rates. Impaired myeloid hematopoiesis and immune cell production were evident, as proved by the decreased numbers of hematopoietic stem and progenitor cells (HSPCs) and granulocytes in the bone marrow of Fhl2-deficient mice. In conclusion, FHL2 regulated emergency myelopoiesis in response to C. albicans, affecting the host’s defense against pathogens.

关键词：

Constructing two-scale network microstructure with nano-Ti5Si3 for superhigh creep resistance

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2019年第8期35卷 1532-1542页

作者： Y.Jiao L.J.Huang S.L.Wei H.X.peng q.An S.Jiang L.Geng State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001 China Center of Analysis and measurement Harbin Institute of TechnologyHarbin 150001 China Department of materials Science and Engineering Massachusetts Institute of TechnologyCambridge MA02139 USA Institute for Composites Science Innovation (InCSI) School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027 China

The improvement of mechanical properties must be achieved by designing and constructing more suitable microstructure,such as hierarchical *** order to significantly enhance the creep resistance of titanium matrix composites(TmCs),two-scale network microstructure was constructed including the first-scale network(m)with micro-TiB whisker(TiBw)reinforcement and the second-scale network(m)with nano-Ti5Si3 reinforcement by powder metallurgy and in-situ *** results showed that the creep rate of the composite was remarkably reduced by an order of magnitude compared with the Ti6Al4V alloy at 550℃,600℃,650℃ under the stresses between 100 mPa and 350 ***,the rupture time of the composite was increased by 20 times,compared with that of the Ti6Al4 Valloy at 550℃/300 *** superior creep resistance could be attributed to the hierarchical *** micro-TiBw reinforcement in the first-scale network boundary contributed to creep resistance primarily by blocking grain boundary sliding,while the nano-Ti5Si3 particle in the second-scale network boundary mainly by hindering phase boundary *** addition,the nano-Ti5Si3 particle was dissolved,and precipitated with smaller size than the primary *** phenomenon was attributed to Si element diffusion under high temperature and external stress,which could further continuously enhance the creep ***,the creep rate during steady-state stage was significantly decreased,which manifested superior creep resistance of the composite.

关键词： Titanium matrix composite Two-scale network microstructure Nano-Ti5Si3 Creep Powder metallurgy

Role of extrusion rate on the microstructure and tensile properties evolution of ultrahigh-strength low-alloy mg-1.0Al-1.0Ca-0.4mn(wt.%)alloy

在线全文

学校读者我要写书评

暂无评论

Journal of magnesium and Alloys 2023年第2期11卷 553-561页

作者： X.q.Liu X.G.qiao R.S.Pei Y.q.Chi L.Yuan m.Y.Zheng School of material Science and Engineering Harbin Institute of TechnologyHarbin 150001China Institut fur metallkunde und meterialphysik RWTH Aachen UniversityAachen D-52056Germany

mg-1.0Al-1.0Ca-0.4mn(AXm1104, wt.%) low alloy was extruded at 200 ℃ with an extrusion ratio of 25 and different ram speeds from 1.0 to 7.0 mm/s. The influence of extrusion rate on microstructure and mechanical properties of the AXm1104 alloy was systematically studied. With the increasing of extrusion rate, the mean dynamically recrystallized(DRXed) grain size of the low alloy and average particles diameter of precipitate second phases were increased, while the degree of grain boundary segregation and the intensity of the basal fiber texture were decreased. With the rising of extrusion rate from 1.0 to 7.0 mm/s, the tensile yield strength(TYS) of the as-extruded AXm1104 alloy was decreased from 445 mPa to 249 mPa, while the elongation to failure(EL) was increased from 5.0% to 17.6%. The TYS, ultimate tensile strength(UTS) and EL of the AXm1104 alloy extruded at the ram speed of 1.5 mm/s was 412 mPa, 419 mPa and 12.0%, respectively,exhibiting comprehensive tensile mechanical properties with ultra-high strength and excellent plasticity. The ultra-high TYS of 412 mPa was mainly due to the strengthening from ultra-fine DRXed grains with segregation of solute atoms at grain boundaries. The strain hardening rate is increase slightly with increasing extrusion speed, which may be ascribed to the increasing mean DRXed grain size with rising extrusion speed. The higher strain hardening rate contributes to the higher EL of these AXm1104 samples extruded at higher ram speed.

关键词： mg-Al-Ca-mn alloy Ultrafine grain Extrusion rate Grain boundary segregation microstructure Ultrahigh strength

Symbol-Pair Distances of Repeated-Root Negacyclic Codes of Length 2^(s) over Galois Rings

在线全文

学校读者我要写书评

暂无评论

Algebra Colloquium 2021年第4期28卷 581-600页

作者： Hai q.Dinh Hualu Liu Roengchai Tansuchat Thang m.Vo Department of mathematical Science Kent State UniversityOhioUSA School of Sciencef Hubei University of Technology Wuhan 430068China Centre of Excellence in Econometrics Faculty of Economics Chiang Mai UniversityChiang Mai 52000Thailand mathematics Department Ohio UniversityOhioUSA Department of General EducationIndustrial University of VinhVinh CityVietnam

Negacyclic codes of length 2^(s) over the Galois ring GR(2a,m)are linearly ordered under set-theoretic inclusion,i.e.,they are the ideals,0≤i≤2^(s)a,of the chain ring GR(2^(a),m)[x]/.This structure is used to obtain the symbol-pair distances of all such negacyclic *** others,for the special case when the alphabet is the finite field F2m(i.e.,a=1),the symbol-pair distance distribution of constacyclic codes over F2m verifies the Singleton bound for such symbol-pair codes,and provides all maximum distance separable symbol-pair constacyclic codes of length 2^(s) over F_(2m).

关键词： negacyclic codes repeated-root codes symbol-pair distance mDS codes

Application of lung microphysiological systems to COVID-19 modeling and drug discovery:a review

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bio-Design and manufacturing 2021年第4期4卷 757-775页

作者： Argus m.Sun Tyler Hoffman Bao q.Luu Nureddin Ashammakhi Song Li Department of Bioengineering Samueli School of EngineeringUniversity of California-Los Angeles420 Westwood Plaza 5121 Engineering V University of CaliforniaLos AngelesCA 90095-1600USA UC San Diego Healthcare UCSDLa JollaCA 92037USA Pulmonary Diseases and Critical Care Scripps Green HospitalScripps HealthLa JollaCA 92037USA Department of Biomedical Engineering College of EngineeringMichigan State UniversityEast LansingMI 48824USA Department of medicine David Geffen School of MedicineUCLALos AngelesCA 90095USA

There is a pressing need for effective therapeutics for coronavirus disease 2019(COVID-19),the respiratory disease caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)*** process of drug development is a costly and meticulously paced process,where progress is often hindered by the failure of initially promising *** aid this chal-lenge,in vitro human microphysiological systems need to be refined and adapted for mechanistic studies and drug screening,thereby saving valuable time and resources during a pandemic *** SARS-CoV-2 virus attacks the lung,an organ where the unique three-dimensional(3D)structure of its functional units is critical for proper respiratory *** in vitro lung models essentially recapitulate the distinct tissue structure and the dynamic mechanical and biological interactions between different cell *** model systems include Transwell,organoid and organ-on-a-chip or microphysiological systems(mPSs).We review models that have direct relevance toward modeling the pathology of COVID-19,including the processes of inflammation,edema,coagulation,as well as lung immune *** also consider the practical issues that may influence the design and fabrication of *** role of lung mPS is addressed in the context of multi-organ models,and it is discussed how high-throughput screening and artificial intelligence can be integrated with lung mPS to accelerate drug development for COVID-19 and other infectious diseases.

关键词： Bioengineering microfluidics COVID-19 Organ-on-a-chip Lung microvascular networks Drug development